Sometimes,it is better to turn around and leave than to insist on and pretend to be well
题目
Sometimes,it is better to turn around and leave than to insist on and pretend to be well
如果别人这样问，最好怎么用英语回复他呢？
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举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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